Offline password cracking via credential-derived session token
Published Mar 3, 2021 · Updated Aug 3, 2024
Credential exposure in AdGuard Home before 0.105.2 allows attackers to brute-force a user's password offline via a stolen session cookie. The session-token generator hashes a salt, username, and stored bcrypt password hash into the cookie instead of using an independent random token. Exploitation requires prior access to a valid cookie and permits password guessing without further interaction with the server.
Summary
What happened
Credential exposure in AdGuard Home before 0.105.2 allows attackers to brute-force a user's password offline via a stolen session cookie. The session-token generator hashes a salt, username, and stored bcrypt password hash into the cookie instead of using an independent random token. Exploitation requires prior access to a valid cookie and permits password guessing without further interaction with the server.
The record
- CVE
- CVE-2021-27935
- Published
- Mar 3, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-522, T1110.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 3, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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